Free API 653 Exam Prep
API 653 Aboveground Storage Tank Inspector
Prepare for the API 653 exam without spending hundreds on expensive prep courses. Free study guides, practice questions, flashcards, and related exam resources.
Quick Facts
Third-party resources · We may earn a commission from purchases.
API 653 Practice Exam: Practical Exam Review with 680 Questions, 4 Full-Length Practice Tests, Clear Answer Explanations, and Study Tips for the API 653 Aboveground Storage Tank Inspector Exam
By Publishing, Ambitionz
$2.49 · 
Explore More API Inspector Certifications
Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.
More From This Family
Videos and articles for deeper review.
API API Inspector Certifications License: Complete Roadmap
Follow this path to organize your licensing and exam preparation
Closed-Book Inspection FoundationsYou are here
Start with scope, inspection planning, tank components, and the formulas you need to recall without references.
Damage Mechanisms and Materials
Study corrosion patterns, brittle-fracture risk, material toughness, cathodic protection, and bottom-lining concepts.
Welding, Repairs, and NDE
Drill WPS/PQR/WPQ rules, repair-versus-alteration decisions, RT/PT/MT/UT basics, and post-repair test logic.
Open-Book Calculations and Code Navigation
Practice shell, bottom, and settlement problems while learning where the rules live in the current API and ASME references.
Mixed Timed Sets
Finish with mixed scenario sets that force quick shifts from formulas to corrosion judgment to documentation questions.
Can You Take the API 653 Exam?
Check if you meet the basic eligibility requirements
- •Experience must be documented on the API application and is subject to verification.
- •The current API 653 exam is delivered in person through Prometric test centers.
- •API 653 certification must be recertified every 3 years through work requirements and continuing professional development.
API 653 Quick Facts
Time to Get Licensed
8-12 weeks typical for experienced tank or mechanical-integrity candidates
From start to license in hand
Total Cost Breakdown
Free API 653 Prep Tools
Reported exam pass rate: API does not publicly publish a current first-time pass rate for API 653.. These figures describe exam candidates, not OpenExamPrep user outcomes. Check the exam sponsor’s website for published statistics.
272 Practice Questions
Covers inspection planning, corrosion, code calculations, repairs, welding, NDE, and documentation.
AI Tutor Support
Get help unpacking shell formulas, bottom evaluation, settlement, and repair-rule judgment.
2026 Current
Review the March-November 2026 BOK/effectivity cycle and current 2026 fee schedule.
Free Practice
Start preparing before you pay for the official API exam and reference materials.
What You'll Study
14 chapters covering the exam topics in this guide
Chapter 1: API 653 Scope, Inspector Certification & Roles
3 sections
Chapter 2: Tank Shell & Roof Components Inspection
4 sections
Chapter 3: Tank Bottom & Foundation Inspection
3 sections
Chapter 4: Corrosion & Damage Mechanisms in Storage Tanks
4 sections
Chapter 5: Materials, Toughness & Brittle Fracture Prevention
3 sections
Chapter 6: Cathodic Protection & Interior Linings
3 sections
Chapter 7: Corrosion Rates, Remaining Life & Inspection Intervals
3 sections
Chapter 8: Tank Shell Minimum Thickness Evaluation
4 sections
Chapter 9: Bottom Plate & Annular Ring Thickness Evaluation
3 sections
Chapter 10: Tank Repairs & Alterations Standards
4 sections
Chapter 11: Welding Procedures, Qualifications & Quality Control
4 sections
Chapter 12: Nondestructive Examination (NDE) Methods
3 sections
Chapter 13: Hydrostatic Testing & Post-Repair Examination
3 sections
Chapter 14: Relief Devices, Tank Settlement & Nameplate Records
4 sections
API 653 Exam Details
API 653 Aboveground Storage Tank Inspector
Administered by American Petroleum Institute (API)
Exam Content Breakdown
Based on the official American Petroleum Institute (API) content outline
API 653 scope, roles, records review, inspection planning and safety, tank components, and external versus internal inspection judgment.
Corrosion mechanisms, material and brittle-fracture concerns, cathodic protection, and tank-bottom lining concepts tied to API 653 service decisions.
Corrosion rates, intervals, shell and bottom evaluation, pitting, settlement, joint efficiency, and impact-testing triggers.
Repair-versus-alteration logic, replacement plates, reconstruction decisions, and welding qualification or procedure controls.
RT, PT, MT, UT, and the testing decisions that follow tank repairs, alterations, and returned-to-service judgments.
Vent devices, settlement monitoring, records, reports, and nameplate or documentation controls.
What's Included
14 Chapters
Complete exam coverage
Practice Quizzes
With detailed explanations
Free to Start
No credit card required
Quality Exam Prep Shouldn't Cost Hundreds
I'm Ran Chen, an engineer with 20+ years of coding experience. I passed my Life Insurance license, EA exam, SIE, Series 6, 63, 65, and finally the CFP® exam.
Through all these exams, one thing became clear: exam prep is expensive. But with AI, we can change that. Quality preparation can now be free for everyone.
What's Next After the API 653?
After passing the API 653, you can pursue these career paths
API 653 Exam FAQ
Official American Petroleum Institute (API) Resources
Verify information with these official sources
More Free Resources
Ready to Start Your Free API 653 Prep?
Review the study guide, practice key concepts, and use the free tools at your own pace.